Watch List notes:

ISLAMIC, 'Abbasid Caliphate. Al-Mahdi. AH 158-169 / AD 775-785. AR Dirham (24mm, 2.95 g, 9h). Citing al-khalifa al-mahdi with Arabic mim. al-Muhamnadiya mint. Dated AH 165 (AD 781/2). Album 215.1; ICV 379. Good VF, minor weak strike at periphery.